芍药汤对溃疡性结肠炎大鼠肠黏膜免疫屏障的干预作用

目的:探讨芍药汤对2,4,6-三硝基苯磺酸(TNBS)诱导的溃疡性结肠炎大鼠肠黏膜免疫屏障的影响。方法:将60只SD大鼠随机分为正常组,模型组,美沙拉嗪组(0.067 g·kg~(-1)),芍药汤低、中、高剂量组(1.8,3.6,7.2 g·kg~(-1)),采用TNBS诱导溃疡性结肠炎模型,对应给予生理盐水、美沙拉嗪、芍药汤灌胃治疗7 d,采用苏木素-伊红(HE)染色观察结肠组织病理学改变,免疫组化法和蛋白免疫印迹法(Western blot)检测肠黏膜中CD4~+T淋巴细胞数量和分泌型免疫球蛋白A(SIg A)蛋白的表达。结果:与正常组比较,模型组大鼠肠黏膜损伤程度评分及病理学评分显著升高(P0.01);CD4~+T淋巴细胞,SIg A蛋白表达显著下降(P0.01);与模型组比较,各给药组大鼠结肠黏膜损伤程度评分及病理学评分显著下降(P0.01),肠黏膜CD4~+T淋巴细胞,SIg A表达明显升高(P0.05,P0.01);与美沙拉嗪组及芍药汤低剂量组比较,芍药汤中、高剂量组肠黏膜损伤程度评分和病理学评分显著下降(P0.01),芍药汤中、高剂量组大鼠肠黏膜中CD4~+T淋巴细胞及SIg A蛋白表达明显升高(P0.05)。结论:芍药汤可通过增加肠黏膜中CD4~+T细胞数量及SIg A分泌的表达,起到减轻肠黏膜损伤,保护肠黏膜免疫屏障功能作用。

Intervention Effect of Shaoyaotang on Intestinal Mucosal Immune Barrier in Rats with Ulcerative Colitis

Objective: To investigate effect of Shaoyaotang on intestinal mucosal immune barrier induced by 2,4,6-trinitrobenzene sulphonic acid (TNBS) in rats with ulcerative colitis.Method: Sixty SD rats were randomly divided into normal group,model group,mesalazine group (0.067 mg·kg^-1),low,medium and high-dose Shaoyaotang groups (1.8,3.6,7.2 g·kg^-1).In the TNBS-induced ulcerative colitis model,saline,mesalazine,peony soup were administered by gavage for 7 days.Hematoxylin-eosin (HE) staining was used to detect the histopathological changes of colon tissue.The number of CD4⁺T lymphocytes and the expression of secretory immunoglobulin A (SIgA) in intestinal mucosa were detected by immunohistochemistry and Western blot.Result: Compared with normal group,the scores of intestinal mucosal injury and the pathological scores in model group increased significantly (P<0.01).The expressions of CD4⁺T lymphocytes and SIgA in the intestinal mucosa of model group decreased significantly (P<0.01).Compared with model group,the scores of colonic mucosal damage and the pathological scores decreased significantly in rats (P<0.01).The expressions of CD4⁺T lymphocytes and SIgA in the intestinal mucosa of rats in each group elevated significantly (P<0.05,P<0.01).Compared with mesalazine group and low-dose Shaoyaotang group,the intestinal mucosal injury score and the pathological scores in medium and high-dose Shaoyaotang groups decreased significantly (P<0.01).The expression levels of CD4⁺T lymphocytes and SIgA protein in the intestinal mucosa of rats in middle and high doses Shaoyaotang groups increased significantly (P<0.05).Conclusion: Shaoyaotang can reduce the intestinal mucosal damage and protect the intestinal mucosal immune barrier by increasing the number of CD4⁺T cells and the expression of SIgA secretion in the intestinal mucosa.